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Incorporation of RF-adaptive array antenna into MIMO receivers

We propose the incorporation of an RF-adaptive array antenna (RF-AAA) into each receive branch on multiple-input multiple output (MIMO) systems. The RF-AAA consists of multiple antenna elements where a variable-gained low-noise amplifier (VG-LNA) and a 360/spl deg/- continuously adjustable phase shi...

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Main Authors:	Nakaya, Y., Toda, T., Hara, S., Takada, J.-I., Oishi, Y.
Format:	Conference Proceeding
Language:	English
Subjects:	Antenna arrays Channel capacity Computer simulation Control systems Low-noise amplifiers MIMO Phase shifters Phased arrays Radio frequency Receiving antennas
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creator	Nakaya, Y. Toda, T. Hara, S. Takada, J.-I. Oishi, Y.
description	We propose the incorporation of an RF-adaptive array antenna (RF-AAA) into each receive branch on multiple-input multiple output (MIMO) systems. The RF-AAA consists of multiple antenna elements where a variable-gained low-noise amplifier (VG-LNA) and a 360/spl deg/- continuously adjustable phase shifter are inserted in each antenna element and an adder for the array output is connected into the RF front-end of each receive branch. The phase shifters are adaptively controlled to increase the total channel capacity of MIMO systems. Computer simulations showed that the capacity of a 2-element-receive-RF-AAA incorporated 2 /spl times/ 2 MIMO system is higher than that of a conventional 3 /spl times/ 3 MIMO system (without RF-AAA) under average transmit power constraints.
doi_str_mv	10.1109/WCT.2003.1321530
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identifier	ISBN: 0780381963
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source	IEEE Electronic Library (IEL) Conference Proceedings
subjects	Antenna arrays Channel capacity Computer simulation Control systems Low-noise amplifiers MIMO Phase shifters Phased arrays Radio frequency Receiving antennas
title	Incorporation of RF-adaptive array antenna into MIMO receivers
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